+
−
stamen
openstreetmap
google
l[[ind[1]]]$xa
l[[ind[2]]]$xa
l[[ind[3]]]$xa
l[[ind[4]]]$xa
l[[ind[5]]]$xa
allobs
pm25_20210216T2200Z
0
5
10
15
20
25
30
35
40
Leaflet
| Map tiles by
Stamen Design
,
CC BY 3.0
— Map data ©
OpenStreetMap
contributors